These words basically mean the same thing. They laid down in front of the man to show him respect. AT: "They bowed down in front of him" (See: [[rc://en/ta/man/translate/translate-symaction]])
Possible meanings are 1) Joseph is truly asking a question to confirm that this man is Benjamin, or 2) it is a rhetorical question. AT: "So this is your youngest brother ... me." (See: [[rc://en/ta/man/translate/figs-rquestion]])